I've download oracle linux 6.0 ISO to setup in my VM workstation, but when the setup progress boot up, I can't find any GUI setup director in my screen.
I chosen install or upgrade existing system item, and I chose language, timezone,etc..... but it still not lead to a GUI installation director, what's up!! is it my version issue or other??

The default installation of Enterprise Linux 6 does not install X-windows or a GUI desktop, unlike in previous versions. You need to customize the package selections and select appropriate packages from the Desktop Environment group.

Could u tell in which STEP I can choose customize now ? I find something wrong in setup progress, the message is below: "unable to start X windons, failed back to text" what's it!? is anything wrong that I chosen?

When you select the "install or upgrade existing system" option, there will be a sub-screen where you can select software and enable additional repositories. There will be options like "basic server" (default), Desktop, Software Development Workstation, etc. Leave the default, but select the "Customize now" button to add the Desktop packages including Gnome and X-windows.